“It’s a very Merry Christmas indeed! We had our Christmas Miracle. Phoenix Robert Lachey decided to show up early and was born on Christmas Eve,” Vanessa wrote on Instagram on Monday. “Mommy, Daddy, Camden & Brooklyn LOVE You very much! #LacheyPartyOf5.”

Nick, 43, and Vanessa, 36, announced her pregnancy in September. At the time, they said Vanessa was due in spring 2017, but they did not reveal an exact date.

The couple, who married in 2011, are also parents to son Camden, 4, and daughter Brooklyn, 23 months.

Their reps didn’t immediately respond to a request for additional comment about the baby boy.